"""
    Time Complexity = O(log(N))
    Space Complexity = O(1)

    Implement int sqrt(int x).
    Compute and return the square root of x, where x is guaranteed to be a non-negative integer.
    Since the return type is an integer, the decimal digits are truncated and only the integer part
    of the result is returned.

    Example:
    Input: 8
    Output: 2
    Explanation: The square root of 8 is 2.82842..., and since
                 the decimal part is truncated, 2 is returned.
"""
